\ TABLE 5 



Response of American Beachgrass to Nitrogen, Phosphorus and Potassium 

 Treatment lb/acre Yield, lb/acre 1965 



465 



757 







Apr 



J un 



Aug 



Sep 



Check 





None 









N 





33 



33 



33 



33 



NP 



N 

 P 



33 

 75 



33 



33 



33 





N 



33 



33 



33 



33 



NPK 



P 

 K 



75 

 75 









962 



NP (30-10-0) MINI III III 919 



Least Significant Difference - .05 287 



Coefficient of Variability - 52$ 



b. Time and Rate of Appl ication of Nitrogen 



From the observations made on several preliminary tests, initiated 

 in 1961, it appeared that these grasses benefited from at least 100 to 150 

 pounds of nitrogen per acre per year. There were also indications that this 

 amount should be split into three or four applications. The September treat- 

 ment appeared to be particularly important from the standpoint of rhizome 

 production the following spring. 



Unfortunately, no usable data were obtained from these trials due to 

 the lack of a suitable method in 1961 and to storm damage and unequal sand 

 encroachment in 1962 and 1963. 



We do know that growth response to the rates and timing of nitrogen 

 application adopted on the strength of these very preliminary trials has 

 been quite satisfactory. It is very likely that with further experimentation, 

 modifications and refinements will be found to be desirable. Data from the 

 two trials on seasonal distribution of growth and nutrient uptake (Figures 

 6, 7 and 8) suggest that the rates indicated above are not unreasonable and 

 could probably be stepped up somewhat where maximum growth is desired. 



Since other questions seemed more pressing in 1964, new trials needed to 

 provide specific information on these points were not undertaken until 1965. 



13 



